 So to put that in context, in one of the studies, they looked at two sets of districts, one set that got a lot of COVID relief and the other set that got less. The set that got more recovered about 50 percent of the learning loss from the pandemic, whereas the districts that got less only recovered 15 percent. So there was a notable gap. But even the districts that got a huge, a large sums of money, they haven't fully recovered from the pandemic. Yeah. How is it measured, Matt?